a) \(\displaystyle \left( { - 3} \right):5{\rm{ }} = {{ - 3} \over 5}\)
b) \(\displaystyle \left( { - 2} \right):\left( { - 7} \right) = {{ - 2} \over { - 7}}\)
c) \(\displaystyle 2:\left( { - 11} \right) = {2 \over { - 11}}\)
d) \(x\) chia cho \(5 \;(x ∈ Z)\) : \(\displaystyle {x \over 5}\)